MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Texture and Planar Anisotropy of r-Value in Duplex Stainless Steel Sheet
Jun-ichi HamadaHirofumi Inoue
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2010 Volume 51 Issue 4 Pages 644-651

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Abstract

The effect of cold-rolling reduction on texture and planar anisotropy of the r-value was investigated in type 329J4L duplex stainless steel (DSS) sheet, which has a two-phase ferrite (α) and austenite (γ) microstructure. In addition, the possibility of predicting the planar anisotropy of the r-value on the basis of the Taylor theory was investigated in consideration of the texture gradient through the thickness. An increase in cold-rolling reduction resulted in the improved average r-value and the strong directionality with a maximum value at the diagonal direction. The α phase had an extremely strong αbcc-fiber texture and the γ phase had β- and αfcc-fiber textures. The texture gradient in the thickness direction was more remarkable in the α phase than in the γ phase. The r-values calculated from the overall texture of the α phase using the relaxed constraints model with two relaxed shear strain constraints e13, e23 and a CRSS ratio of 1.1 for {112} and {011}⟨111⟩ glide systems were in quite good agreement with the experimental r-values. This suggested that slip deformation in the α matrix was dominant for type 329J4L DSS sheet. However, the difference between the experimental and calculated results was remarkable in the vicinity of the diagonal direction.

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© 2010 The Japan Institute of Metals and Materials
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